Economic Efficiency Calculation at a Moscow Sewage Station

The cost savings calculation is based on lowered head losses as a result of the installation and use of ARI air valves on the system. The results were gathered from tests that were performed over a period of time that reflected the changing working conditions at the pump station. The use of the ARI Air Valves resulted in lowered head losses (h) measured in meters and was characteristic at all the pump stations that installed ARI Air Valves.

1.  Energy Savings measured during the first half of 2008 at specific pump stations using high-voltage pumps.
   Energy savings in kWh for the first half of the year 2008 was calculated according to the formula:
   
   h = measured head loss savings
   Q = water volume 1000m³
   0.7 = pump and motor efficiency
   All calculations based on the rate of 0.7401 Rubles/kWh
   
   

   N	Station	Q,    x1000m³	h,(m)   Head loss saving	Energy   Saving, kWh	Cost Saving   Rubles
   1	Brateevskaya	8793.0	2.1	71,751	53,103
   2	Vychinskaya	12020.0	2.1	98,083	72,591
   3	Lyblenskaya	45394.0	5.3	934,857	691,888
   4	Novo-Kuncevskaya	23737.0	6.0	553,411	409,579
   5	Novo-Solncevskaya	26697.2	6.0	622,426	460,657
   6	Ramenskaya	11383.0	2.1	92,885	68,744
   7	Savinskaya	54386.0	2.4	507,188	357,370
   8	Tushinskaya	31289.0	2.4	291,792	215,955
   9	Filevskaya	104834.0	5.4	2,199,717	1,628,011
   10	Chapilovskaya	100129.0	5.6	2,178,807	1,612,535
   11	Centralnaya	38913.0	4.8	725,783	537,152
   12	Tcherkizovskaya	94706.0	5.6	2,060,803	1,525,200
   13	Yugo-Vostochnaya	66301.0	5.1	1,313,896	972,414
   	Total:	618582.2		11,651,399	8,623,199

   
   
   
2.  Cost Savings measured during the first half of 2008 at specific pump stations using low-voltage pumps.
   Energy Savings in kWh for the first half of 2008 was measured according to the formula:
   
   h = measured head loss savings
   Q = water volume 1000m³
   0.7 = pump and motor savings
   All calculations based on the rate of 1.7738 Rubles/kWh
   
   

   N	Station	Q,    x1000m³	h,(m)   Head loss saving	Energy Savings. kWh	Cost Savings, Rubles
   1	Losevskaya	4871.5	2.5	86,180	48,585
   2	Marinskaya	6329.8	2.4	106,889	60,260
   3	Novo-  Kozhuhovskaya	4280.2	2.4	68,836	38,807
   4	Paveletckaya	3910.0	2.1	59,738	33,678
   5	Severnoe Butovo	5492.6	3.8	145,751	82,169
   6	Chorosheevskaya	2978.6	2.4	47,903	27,006
   	Total:	27862.7		515,297	290,505

   
   
   

   Total for 19 stations:

   646444.9

   11,941,904

   9,138,496

   
   Expected cost savings for one full year:
             23,883,808 kWh                       18,276,992 Rubles
   
   
   Cost Savings Calculations at a Moscow Sewage Station After the Installation of ARI Hydraulic Check Valves
   
   The cost savings calculation is based on lowered head losses as a result of the installation and use of ARI hydraulic check valves on the system. The results were gathered from tests that were performed over a period of time that reflected the changing working conditions at the pump station.
   The use of the ARI Hydraulic Check Valves resulted in lowered head losses (h) = 0.9m Energy savings in kWh for the first half of 2008 was measured according to the formula:
   
   
   Q = water volume 1000m3
   0.7 = pump and motor savings
   n = number of check valves
   TiPump = work time of one pump during first half of year 2008 
   QPS = total flow at a particular pumping station
   All calculations based on the rate of 0.7401 Rubles/kWh
   
   
   
   
   Actual Energy Savings Measurements With the Installation and Use of ARI Air Valves
   
   Estimated pump energy savings is based on the total specific energy consumption (E) divided by the total volume of water (Q) for a specific time period, With and without the use of ARI Air Valves (U = E/Q).
   To eliminate the influence of different work regimens of the pump station on the savings, a period of 7 days was used for the calculations.
   

Pump Station with High-Voltage Pumps

The energy saving is calculated by the formula:

when: Q x1000m³ = total volume of water for the first half year 2008
and: 
The cost savings is calculated according to the rate of 0.7401 Rubles/kWh for the pump stations with high-voltage pumps and 1.7738 Rubles/kWh for the pump stations with low-voltage pumps.

Actual Energy Savings Calculation with the Installation and Use of ARI Hydraulic Check Valves

Estimated pump energy savings is based on the total specific energy consumption (E) divided by the total volume of water (Q) for a specific time period, With and without the use of ARI Hydraulic Check Valves (U = E/Q).
To eliminate the influence of different work regimens of the pump station on the savings, a period of 4 days was used for the calculations.

The savings effect is calculated by the formula:

when: Q x1000m³ = total volume of water for the first half year 2008
and:   
The cost savings is calculated according to the rate of 0.7401 Rubles/kWh for the pump stations with high-voltage pumps.